As far as I can tell, it is what it says it is. A Nanny Still designed filigree cased glass bowl, for Riihimaen Lasi Oy. A Pallo bowl, as is shown on page 225 of Designlasinhintakirja, but hard to tell for sure, as it is just a diagram.The signature looks good to me.

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Enjoying being in the Midlands.......some people are just amazing....xx

You can purchase it online. It is in Finnish, with a basci translation list at the back of the book. All pictures are sketches and are in black and white, but I have found it really helpful, especially as I just adore Finnish glass (particularly Riihimaen Lasi)